18 Sep: Comprehending Python List Comprehensions

Python list comprehensions provide a short cut to the common task of performing an operation on every list member:

for i in list:
    if i < 10:
        j.append(i + 5)

The same code written as a list comprehension looks like this:

j = [i + 5 for i in list if i < 10]

Which has these components:

• i + 5: perform this operation on each list member
• for i in list: walk through this list with each member becoming variable i
• if i < 10: optional statement to decide whether to perform the operation